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Complex numbers
Question | Answer |
---|---|
5/(5+8i) | multiply both numerator & denominator by (5-8i)= (25-40i)/25-64i^2. change i^2 to -1 and simplify. answer 25/89 -40i/89 |
(5a+2b) - (8a -3b) | =5a+2b-8a+3b, which equals -3a+5b |
what does (i)^2 equal? | -1 |
(a+b)(a-b) | a^2-b^2 |
what is the square root of -1 | i |
(2a-3b) - (a-6b) | a+3b |
(9+7i)/(1+i) | multiply both numerator and denominator by (1-i) and factor out...answer is 8-i |
(7-i)(4-7i)/(4+7i)(4-7i) | 21/65 -53i/65 |
what is the complex conjugate of (a+bi)? | (a-bi) |
7/3i | - 7i/3 |